Transactions of Materials and Heat Treatment

Title：Hot deformation behavior of as-cast Ni-based superalloy GH4698

Authors： Wang Yan Gu Yu Wang Jue Li Jidong

Unit： Taiyuan Iron and Steel Group Company Limited Nanjing Institute of Engineering

KeyWords： superalloy GH4698 hot deformation microstructure performance constitutive equation dynamic recrystallization

ClassificationCode：TG335.3

year,vol(issue):pagenumber：2021,46(11):250-254

Abstract：

The hot deformation behavior of as-cast Ni-base superalloy GH4698 under different deformation conditions was studied by means of thermal simulation. The results show that the deformation amount required for complete dynamic recrystallization of the alloy decreases with the increasing of deformation temperature in the experimental temperature range. When the strain rate is 1 s-1, the true strain decreases from 0.2 (Deformation amount of 17%) at 1000 ℃ to 0.08 (Deformation amount of 7%) at 1200 ℃, and under the condition of high strain rate, it shows the typical characteristics of three stages, such as “work hardening”, “work hardening+dynamic recovery” and “work hardening+dynamic recrystallization”. In addition, at high deformation temperature and low strain rate, the thermal activation is sufficient, and slow deformation is conducive to atomic diffusion and grain boundary migration. It can be seen from the stress-strain curve that the alloy has a higher deformation resistance, and the activation energy of hot deformation for the alloy calculated by the constitutive equation is 425 kJ.

Funds：

山西省应用基础研究项目(201801D121077)；山西省应用基础研究计划（201901D111460）；山西省关键核心技术和共性技术研发攻关专项（20201102017）

作者简介：王岩（1982-），男，博士，高级工程师，E-mail：15448681@qq.com

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